Do cosmetics have an expiry date?
The shelf life for eye-area cosmetics is more limited than for other products. Because of repeated microbial exposure during use and the risk of eye infections, manufacturers usually recommend discarding mascara two to four months after purchase. If mascara becomes dry, discard it. Do not add water or even worse, saliva to moisten it. That will introduce bacteria to the product. If you have an eye infection, consult a physician immediately, stop using all eye-area cosmetics and discard those you were using when the infection occurred.
Other cosmetics that are likely to have an unusually short shelf life are certain "all natural" products that may contain plant-derived substances conducive to microbial growth. It is also important to consider the increased risk of contamination in products containing non-traditional or no preservatives at all. - Keitumetse Segoai